diff --git a/output/schema/schema.json b/output/schema/schema.json
index 95f9ef338e..5585c3d163 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -52674,26 +52674,11 @@
           "name": "exclude",
           "required": false,
           "type": {
-            "items": [
-              {
-                "kind": "instance_of",
-                "type": {
-                  "name": "string",
-                  "namespace": "_builtins"
-                }
-              },
-              {
-                "kind": "array_of",
-                "value": {
-                  "kind": "instance_of",
-                  "type": {
-                    "name": "string",
-                    "namespace": "_builtins"
-                  }
-                }
-              }
-            ],
-            "kind": "union_of"
+            "kind": "instance_of",
+            "type": {
+              "name": "TermsExclude",
+              "namespace": "_types.aggregations"
+            }
           }
         },
         {
@@ -52701,26 +52686,11 @@
           "name": "include",
           "required": false,
           "type": {
-            "items": [
-              {
-                "kind": "instance_of",
-                "type": {
-                  "name": "string",
-                  "namespace": "_builtins"
-                }
-              },
-              {
-                "kind": "array_of",
-                "value": {
-                  "kind": "instance_of",
-                  "type": {
-                    "name": "string",
-                    "namespace": "_builtins"
-                  }
-                }
-              }
-            ],
-            "kind": "union_of"
+            "kind": "instance_of",
+            "type": {
+              "name": "TermsInclude",
+              "namespace": "_types.aggregations"
+            }
           }
         }
       ],
diff --git a/output/typescript/types.ts b/output/typescript/types.ts
index 39062c4b1d..fd0938bfb7 100644
--- a/output/typescript/types.ts
+++ b/output/typescript/types.ts
@@ -3309,8 +3309,8 @@ export type AggregationsFrequentItemSetsBucket = AggregationsFrequentItemSetsBuc
 
 export interface AggregationsFrequentItemSetsField {
   field: Field
-  exclude?: string | string[]
-  include?: string | string[]
+  exclude?: AggregationsTermsExclude
+  include?: AggregationsTermsInclude
 }
 
 export type AggregationsGapPolicy = 'skip' | 'insert_zeros' | 'keep_values'
diff --git a/specification/_types/aggregations/bucket.ts b/specification/_types/aggregations/bucket.ts
index 232e799f20..8ef083408f 100644
--- a/specification/_types/aggregations/bucket.ts
+++ b/specification/_types/aggregations/bucket.ts
@@ -1148,12 +1148,12 @@ export class FrequentItemSetsField {
    * Values to exclude.
    * Can be regular expression strings or arrays of strings of exact terms.
    */
-  exclude?: string | string[]
+  exclude?: TermsExclude
   /**
    * Values to include.
    * Can be regular expression strings or arrays of strings of exact terms.
    */
-  include?: string | string[]
+  include?: TermsInclude
 }
 
 export class FrequentItemSetsAggregation {